Renesas R5F21254SNFP#V2

Overview

R5F21254SNFP#V2 from Renesas Electronics is a 16-bit R8C/Tiny Series microcontroller in a 52-pin LQFP package, operating at up to 20 MHz with 16 KB flash program memory, 1 KB RAM, and dual 1 KB data flash blocks. It integrates a 10-bit 12-channel ADC, UART0/UART1, I²C bus interface, hardware LIN module (using timer RA and UART0), and real-time clock functionality via timer RE. It targets embedded control in consumer appliances and industrial equipment requiring low-power operation down to 0.7 µA in stop mode.

For engineers reviewing the R5F21254SNFP#V2 datasheet, R5F21254SNFP#V2 pinout, R5F21254SNFP#V2 application, or R5F21254SNFP#V2 equivalent, key selection criteria include its N-version temperature range (–20°C to +85°C), on-chip high-speed oscillator with frequency adjustment, wait-mode current of 2.0 µA at 3.0 V with 32 kHz XCIN, and support for LIN 2.0 physical layer compliance via dedicated hardware.

Technical Context

The R5F21254SNFP#V2 implements the R8C/Tiny CPU core with 89 fundamental instructions and executes code at 50 ns minimum instruction time (20 MHz, 3.0–5.5 V). Its memory architecture separates 16 KB flash program ROM from two independent 1 KB data flash blocks-enabling nonvolatile parameter storage with 10,000 erase/write cycles per block.

Peripheral integration includes Timer RD (16-bit × 2 channels with input capture/output compare), Timer RE (real-time clock with compare match), and dual UARTs supporting LIN communication when paired with timer RA. Clock generation uses three independent circuits: XIN-based (up to 20 MHz), high-speed on-chip oscillator (adjustable), and 32 kHz XCIN-based RTC source.

Key Specifications

Pinout & Package

Package: PLQP0052JA-A - 52-pin LQFP, 0.65 mm pitch, 10 mm × 10 mm body, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F21254SNFP#V2, R5F21255SNFP offers expanded program memory for complex algorithms while maintaining identical low-power behavior and peripheral set; R5F21244SNFP removes data flash to reduce cost but eliminates in-field parameter retention-making it unsuitable for applications requiring calibration persistence.

Availability

R5F21254SNFP#V2 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and automotive body electronics requiring stable component supply across extended production lifecycles.

Supply support for R5F21254SNFP#V2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, and power devices for industrial, automotive, and consumer markets.

The R8C/25 Group, including R5F21254SNFP#V2, was designed for cost-sensitive embedded control applications demanding integrated data flash, LIN capability, and ultra-low-power operation in compact LQFP packages.

FAQ

What is the maximum operating frequency of the R5F21254SNFP#V2 and under what voltage conditions?

The R5F21254SNFP#V2 achieves a maximum operating frequency of 20 MHz, but only when supplied with VCC between 3.0 V and 5.5 V. At lower voltages-2.7–5.5 V-it supports up to 10 MHz, and at 2.2–5.5 V, up to 5 MHz. These limits are defined by Renesas' electrical characteristics specification and must be observed to ensure reliable instruction execution and peripheral timing.

Does the R5F21254SNFP#V2 support hardware LIN communication, and how is it implemented?

Yes, the R5F21254SNFP#V2 implements hardware LIN 2.0 physical layer support using UART0 combined with timer RA for precise baud rate generation and synchronization. This integrated approach eliminates the need for an external LIN transceiver in basic slave-node applications, reducing bill-of-materials cost and PCB area while maintaining full protocol compliance.

How many data flash blocks does the R5F21254SNFP#V2 contain, and what is their endurance rating?

The R5F21254SNFP#V2 contains two independent 1 KB data flash blocks, each rated for 10,000 erase/write cycles. This architecture enables robust nonvolatile storage of calibration data, device configuration, or usage logs without interfering with program ROM operations-critical for field-upgradable embedded systems.

What is the purpose of the XCIN/XCOUT pins on the R5F21254SNFP#V2, and what crystal frequency do they support?

The XCIN/XCOUT pins on the R5F21254SNFP#V2 connect to a 32.768 kHz tuning-fork crystal to drive the real-time clock (RTC) function within timer RE. This dedicated low-frequency oscillator enables accurate timekeeping and ultra-low-power wait mode operation (2.0 µA), independent of the main system clock.

Is the R5F21254SNFP#V2 pin-compatible with other members of the R8C/25 Group, and what package does it use?

Yes, the R5F21254SNFP#V2 uses the PLQP0052JA-A 52-pin LQFP package and shares identical pin assignments and electrical characteristics with all other R8C/25 Group variants in the same package-including R5F21255SNFP and R5F21256SNFP-enabling drop-in memory upgrades without PCB redesign.